Tar reduction in downdraft biomass gasifier using a primary method

Einara Blanco Machin, Daniel Travieso Pedroso, Nestor Proenza, José Luz Silveira, Leonetto Conti, Lúcia Bollini Braga and Adrian Blanco Machin

Renewable Energy, 2015, vol. 78, issue C, 478-483

Abstract: This work present a novel primary method, for tar reduction in downdraft gasification. The principle of this new technology is to change the fluid dynamic behaviour of the mixture, formed by pyrolysis product and gasification agent in combustion zone; allowing a homogeneous temperature distribution in radial direction in this reaction zone. To achieve the change in the fluid dynamic behaviour of the mixture; the entry of gasification agent to combustion zone is oriented by means of wall nozzles in order to form a swirl flow. This modification in combination with the extension of the reduction zone, will allow, to increases the efficiency of the tar thermal cracking inside the gasifier and the extension of the Boudouard reactions. Consequently, the quantity of tar passing through the combustion zone without cracking and the concentration of tar in the final gas, decrease significantly in relation with the common value obtained for this type of reactor, without affecting significantly the heating value of the producer gas. In this work is presented a new design for 15 kW downdraft gasification reactor, with this technology implemented, the tar content obtained in the experiments never overcome 10mg/Nm3, with a lower heating value of 3.97MJ/Nm3.

Keywords: Biomass; Downdraft gasifier; Gasification; Tar; Swirl flow (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (9)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:78:y:2015:i:c:p:478-483

DOI: 10.1016/j.renene.2014.12.069

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